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. Oj21.83 . . from 6,000-7,000 feet. Average annual precipitation is 8-12 inches, and the soil moisture regime is torric bordering on ustic. Average annual soil temperature at 20 inches is less than 470F, and the difference between sunumner and winter temperatures is more than gOF,' frigid. Frost-free season is 100-120 days. The association has about 50 percent Ustic Torriorthents, 45 percent Borollic Camborthids, and 5 percent of unidentified minor soils, located in the north-central part of Moffat County, Ustic Torriorthents are deep, well-drained soils on alluvial fans. Typically these soils have a light-colored, calcareous, salty, loamy surface layer, Al horizon, less than 7 inches thick. The substratum, 7-40 inch layer, C horizons, is a light-colored, calcareous, salty, and loamy material. Permeability is rapid; effective rooting depth is 40-60 inches. Available water capacity'is high; surface runoff is medium; erosion hazard is high l'! j l ! '1' " to very high. Borollic Camborthids are deep, well-drained soils on floodplains. Typically they have a dark-colored, loamy surface layer, Al horizon, about 10 inches thick. The subsoil, (10-40 inch layer), has a light-colored, I j ~.!/ altered, B2 horizon, loamy material, calcareous in the lower part. The lJ 1-,~ ~:{ J!". substratum, 40-60 inch layer, C horizon, is a calcareous loamy material. Permeability is slow; effective rooting depth is 40-60 inches. Available ~ k water'capacity is high; surface runoff is medium; erosion hazard is high- ,;.1 i~ ';.' ~.l it. "y. ;~ f:\!, q Ii ., j' 'i'~ ~ very high, Sediment yield from this association is 0.5-3.0 acre-feet/square mile/year. These soils are'used mainly for range and wildlife, General qg ~'''!f''i:.-'; ~ .:....~ ..' ,. .--.-- ~'~'---' -'""';"'""'-